Hey bro, there's one that I know of Cow Mountain which is Ukiah and it has a few different trails. I am part of a FB group called "NorCal Gravity" and there's a bunch of people in your area that ride that are in the group. One guy works at Dave's Bike Shop in Ukiah and he does free shuttles on a lot of Sundays up at Cow. If you're interested let me know and I'll get you in the group....there's always people looking to ride.